Abstract
This Letter aims to present a highly secure 3D faster-than-Nyquist non-orthogonal multiple access (3D-FTN-NOMA) scheme based on non-orthogonal discrete Fourier transform (NODFT) matrix precoding and multi-level chaotic perturbation. The NODFT matrix precoding technique is employed to operate on the 3D-NOMA system for generating the 3D-FTN-NOMA signal. To address the dual security vulnerabilities in the 3D-FTN-NOMA system, chaotic vector technology is employed to achieve multi-level perturbation of both the original information from different users and the superimposed information. With a net rate of 105.98 Gb/s, we experimentally verified the proposed scheme on a 2 km 7-core fiber system based on intensity modulation/direct detection (IM/DD). By employing NODFT precoding, the 3D-FTN-NOMA system using low-order modulation formats can achieve the transmission capacity of the 3D-NOMA signal using high-order modulation formats within the same system and bandwidth, resulting in a receiving sensitivity gain of approximately 5 dB. Moreover, our proposed encryption scheme effectively addresses the dual security vulnerabilities of 3D-FTN-NOMA and enables comprehensive secure transmission of signals.
Published Version
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